Mercurial > hg > truffle
annotate src/share/vm/oops/klass.hpp @ 11096:71180a6e5080
7133260: AllocationProfiler uses space in metadata and doesn't seem to do anything useful.
Summary: Remove -Xaprof and Klass::_alloc_count & ArrayKlass::_alloc_size.
Reviewed-by: stefank, coleenp
| author | jiangli |
|---|---|
| date | Wed, 03 Jul 2013 17:26:59 -0400 |
| parents | e0c9a1d29eb4 |
| children | 6b0fd0964b87 740e263c80c6 d0afbee540e0 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 7956 | 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_OOPS_KLASS_HPP |
| 26 #define SHARE_VM_OOPS_KLASS_HPP | |
| 27 | |
| 28 #include "memory/genOopClosures.hpp" | |
| 29 #include "memory/iterator.hpp" | |
| 30 #include "memory/memRegion.hpp" | |
| 31 #include "memory/specialized_oop_closures.hpp" | |
| 32 #include "oops/klassPS.hpp" | |
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33 #include "oops/metadata.hpp" |
| 1972 | 34 #include "oops/oop.hpp" |
| 35 #include "runtime/orderAccess.hpp" | |
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36 #include "trace/traceMacros.hpp" |
| 1972 | 37 #include "utilities/accessFlags.hpp" |
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38 #include "utilities/macros.hpp" |
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39 #if INCLUDE_ALL_GCS |
| 1972 | 40 #include "gc_implementation/concurrentMarkSweep/cmsOopClosures.hpp" |
| 41 #include "gc_implementation/g1/g1OopClosures.hpp" | |
| 42 #include "gc_implementation/parNew/parOopClosures.hpp" | |
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43 #endif // INCLUDE_ALL_GCS |
| 1972 | 44 |
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45 // |
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46 // A Klass provides: |
| 0 | 47 // 1: language level class object (method dictionary etc.) |
| 48 // 2: provide vm dispatch behavior for the object | |
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49 // Both functions are combined into one C++ class. |
| 0 | 50 |
| 51 // One reason for the oop/klass dichotomy in the implementation is | |
| 52 // that we don't want a C++ vtbl pointer in every object. Thus, | |
| 53 // normal oops don't have any virtual functions. Instead, they | |
| 54 // forward all "virtual" functions to their klass, which does have | |
| 55 // a vtbl and does the C++ dispatch depending on the object's | |
| 56 // actual type. (See oop.inline.hpp for some of the forwarding code.) | |
| 57 // ALL FUNCTIONS IMPLEMENTING THIS DISPATCH ARE PREFIXED WITH "oop_"! | |
| 58 | |
| 59 // Klass layout: | |
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60 // [C++ vtbl ptr ] (contained in Metadata) |
| 0 | 61 // [layout_helper ] |
| 62 // [super_check_offset ] for fast subtype checks | |
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63 // [name ] |
| 0 | 64 // [secondary_super_cache] for fast subtype checks |
| 65 // [secondary_supers ] array of 2ndary supertypes | |
| 66 // [primary_supers 0] | |
| 67 // [primary_supers 1] | |
| 68 // [primary_supers 2] | |
| 69 // ... | |
| 70 // [primary_supers 7] | |
| 71 // [java_mirror ] | |
| 72 // [super ] | |
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73 // [subklass ] first subclass |
| 0 | 74 // [next_sibling ] link to chain additional subklasses |
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75 // [next_link ] |
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76 // [class_loader_data] |
| 0 | 77 // [modifier_flags] |
| 78 // [access_flags ] | |
| 79 // [last_biased_lock_bulk_revocation_time] (64 bits) | |
| 80 // [prototype_header] | |
| 81 // [biased_lock_revocation_count] | |
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82 // [_modified_oops] |
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83 // [_accumulated_modified_oops] |
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84 // [trace_id] |
| 0 | 85 |
| 86 | |
| 87 // Forward declarations. | |
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88 template <class T> class Array; |
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89 template <class T> class GrowableArray; |
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90 class ClassLoaderData; |
| 0 | 91 class klassVtable; |
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92 class ParCompactionManager; |
| 7956 | 93 class KlassSizeStats; |
| 0 | 94 |
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95 class Klass : public Metadata { |
| 0 | 96 friend class VMStructs; |
| 97 protected: | |
| 98 // note: put frequently-used fields together at start of klass structure | |
| 99 // for better cache behavior (may not make much of a difference but sure won't hurt) | |
| 100 enum { _primary_super_limit = 8 }; | |
| 101 | |
| 102 // The "layout helper" is a combined descriptor of object layout. | |
| 103 // For klasses which are neither instance nor array, the value is zero. | |
| 104 // | |
| 105 // For instances, layout helper is a positive number, the instance size. | |
| 106 // This size is already passed through align_object_size and scaled to bytes. | |
| 107 // The low order bit is set if instances of this class cannot be | |
| 108 // allocated using the fastpath. | |
| 109 // | |
| 110 // For arrays, layout helper is a negative number, containing four | |
| 111 // distinct bytes, as follows: | |
| 112 // MSB:[tag, hsz, ebt, log2(esz)]:LSB | |
| 113 // where: | |
| 114 // tag is 0x80 if the elements are oops, 0xC0 if non-oops | |
| 115 // hsz is array header size in bytes (i.e., offset of first element) | |
| 116 // ebt is the BasicType of the elements | |
| 117 // esz is the element size in bytes | |
| 118 // This packed word is arranged so as to be quickly unpacked by the | |
| 119 // various fast paths that use the various subfields. | |
| 120 // | |
| 121 // The esz bits can be used directly by a SLL instruction, without masking. | |
| 122 // | |
| 123 // Note that the array-kind tag looks like 0x00 for instance klasses, | |
| 124 // since their length in bytes is always less than 24Mb. | |
| 125 // | |
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126 // Final note: This comes first, immediately after C++ vtable, |
| 0 | 127 // because it is frequently queried. |
| 128 jint _layout_helper; | |
| 129 | |
| 130 // The fields _super_check_offset, _secondary_super_cache, _secondary_supers | |
| 131 // and _primary_supers all help make fast subtype checks. See big discussion | |
| 132 // in doc/server_compiler/checktype.txt | |
| 133 // | |
| 134 // Where to look to observe a supertype (it is &_secondary_super_cache for | |
| 135 // secondary supers, else is &_primary_supers[depth()]. | |
| 136 juint _super_check_offset; | |
| 137 | |
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138 // Class name. Instance classes: java/lang/String, etc. Array classes: [I, |
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139 // [Ljava/lang/String;, etc. Set to zero for all other kinds of classes. |
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140 Symbol* _name; |
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141 |
| 0 | 142 // Cache of last observed secondary supertype |
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143 Klass* _secondary_super_cache; |
| 0 | 144 // Array of all secondary supertypes |
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145 Array<Klass*>* _secondary_supers; |
| 0 | 146 // Ordered list of all primary supertypes |
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147 Klass* _primary_supers[_primary_super_limit]; |
| 0 | 148 // java/lang/Class instance mirroring this class |
| 149 oop _java_mirror; | |
| 150 // Superclass | |
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151 Klass* _super; |
| 0 | 152 // First subclass (NULL if none); _subklass->next_sibling() is next one |
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153 Klass* _subklass; |
| 0 | 154 // Sibling link (or NULL); links all subklasses of a klass |
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155 Klass* _next_sibling; |
| 0 | 156 |
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157 // All klasses loaded by a class loader are chained through these links |
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158 Klass* _next_link; |
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159 |
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160 // The VM's representation of the ClassLoader used to load this class. |
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161 // Provide access the corresponding instance java.lang.ClassLoader. |
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162 ClassLoaderData* _class_loader_data; |
| 0 | 163 |
| 164 jint _modifier_flags; // Processed access flags, for use by Class.getModifiers. | |
| 165 AccessFlags _access_flags; // Access flags. The class/interface distinction is stored here. | |
| 166 | |
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167 // Biased locking implementation and statistics |
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168 // (the 64-bit chunk goes first, to avoid some fragmentation) |
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169 jlong _last_biased_lock_bulk_revocation_time; |
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170 markOop _prototype_header; // Used when biased locking is both enabled and disabled for this type |
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171 jint _biased_lock_revocation_count; |
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172 |
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173 TRACE_DEFINE_KLASS_TRACE_ID; |
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174 |
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175 // Remembered sets support for the oops in the klasses. |
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176 jbyte _modified_oops; // Card Table Equivalent (YC/CMS support) |
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177 jbyte _accumulated_modified_oops; // Mod Union Equivalent (CMS support) |
| 0 | 178 |
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179 // Constructor |
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180 Klass(); |
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181 |
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182 void* operator new(size_t size, ClassLoaderData* loader_data, size_t word_size, TRAPS); |
| 0 | 183 |
| 184 public: | |
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185 bool is_klass() const volatile { return true; } |
| 0 | 186 |
| 187 // super | |
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188 Klass* super() const { return _super; } |
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189 void set_super(Klass* k) { _super = k; } |
| 0 | 190 |
| 191 // initializes _super link, _primary_supers & _secondary_supers arrays | |
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192 void initialize_supers(Klass* k, TRAPS); |
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193 void initialize_supers_impl1(Klass* k); |
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194 void initialize_supers_impl2(Klass* k); |
| 0 | 195 |
| 196 // klass-specific helper for initializing _secondary_supers | |
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197 virtual GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); |
| 0 | 198 |
| 199 // java_super is the Java-level super type as specified by Class.getSuperClass. | |
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200 virtual Klass* java_super() const { return NULL; } |
| 0 | 201 |
| 202 juint super_check_offset() const { return _super_check_offset; } | |
| 203 void set_super_check_offset(juint o) { _super_check_offset = o; } | |
| 204 | |
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205 Klass* secondary_super_cache() const { return _secondary_super_cache; } |
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206 void set_secondary_super_cache(Klass* k) { _secondary_super_cache = k; } |
| 0 | 207 |
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208 Array<Klass*>* secondary_supers() const { return _secondary_supers; } |
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209 void set_secondary_supers(Array<Klass*>* k) { _secondary_supers = k; } |
| 0 | 210 |
| 211 // Return the element of the _super chain of the given depth. | |
| 212 // If there is no such element, return either NULL or this. | |
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213 Klass* primary_super_of_depth(juint i) const { |
| 0 | 214 assert(i < primary_super_limit(), "oob"); |
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215 Klass* super = _primary_supers[i]; |
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216 assert(super == NULL || super->super_depth() == i, "correct display"); |
| 0 | 217 return super; |
| 218 } | |
| 219 | |
| 220 // Can this klass be a primary super? False for interfaces and arrays of | |
| 221 // interfaces. False also for arrays or classes with long super chains. | |
| 222 bool can_be_primary_super() const { | |
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223 const juint secondary_offset = in_bytes(secondary_super_cache_offset()); |
| 0 | 224 return super_check_offset() != secondary_offset; |
| 225 } | |
| 226 virtual bool can_be_primary_super_slow() const; | |
| 227 | |
| 228 // Returns number of primary supers; may be a number in the inclusive range [0, primary_super_limit]. | |
| 229 juint super_depth() const { | |
| 230 if (!can_be_primary_super()) { | |
| 231 return primary_super_limit(); | |
| 232 } else { | |
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233 juint d = (super_check_offset() - in_bytes(primary_supers_offset())) / sizeof(Klass*); |
| 0 | 234 assert(d < primary_super_limit(), "oob"); |
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235 assert(_primary_supers[d] == this, "proper init"); |
| 0 | 236 return d; |
| 237 } | |
| 238 } | |
| 239 | |
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240 // store an oop into a field of a Klass |
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241 void klass_oop_store(oop* p, oop v); |
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242 void klass_oop_store(volatile oop* p, oop v); |
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243 |
| 0 | 244 // java mirror |
| 245 oop java_mirror() const { return _java_mirror; } | |
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246 void set_java_mirror(oop m) { klass_oop_store(&_java_mirror, m); } |
| 0 | 247 |
| 248 // modifier flags | |
| 249 jint modifier_flags() const { return _modifier_flags; } | |
| 250 void set_modifier_flags(jint flags) { _modifier_flags = flags; } | |
| 251 | |
| 252 // size helper | |
| 253 int layout_helper() const { return _layout_helper; } | |
| 254 void set_layout_helper(int lh) { _layout_helper = lh; } | |
| 255 | |
| 256 // Note: for instances layout_helper() may include padding. | |
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257 // Use InstanceKlass::contains_field_offset to classify field offsets. |
| 0 | 258 |
| 259 // sub/superklass links | |
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260 InstanceKlass* superklass() const; |
| 0 | 261 Klass* subklass() const; |
| 262 Klass* next_sibling() const; | |
| 263 void append_to_sibling_list(); // add newly created receiver to superklass' subklass list | |
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264 |
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265 void set_next_link(Klass* k) { _next_link = k; } |
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266 Klass* next_link() const { return _next_link; } // The next klass defined by the class loader. |
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267 |
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268 // class loader data |
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269 ClassLoaderData* class_loader_data() const { return _class_loader_data; } |
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270 void set_class_loader_data(ClassLoaderData* loader_data) { _class_loader_data = loader_data; } |
| 0 | 271 |
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272 // The Klasses are not placed in the Heap, so the Card Table or |
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273 // the Mod Union Table can't be used to mark when klasses have modified oops. |
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274 // The CT and MUT bits saves this information for the individual Klasses. |
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275 void record_modified_oops() { _modified_oops = 1; } |
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276 void clear_modified_oops() { _modified_oops = 0; } |
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277 bool has_modified_oops() { return _modified_oops == 1; } |
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278 |
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279 void accumulate_modified_oops() { if (has_modified_oops()) _accumulated_modified_oops = 1; } |
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280 void clear_accumulated_modified_oops() { _accumulated_modified_oops = 0; } |
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281 bool has_accumulated_modified_oops() { return _accumulated_modified_oops == 1; } |
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282 |
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283 protected: // internal accessors |
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284 Klass* subklass_oop() const { return _subklass; } |
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285 Klass* next_sibling_oop() const { return _next_sibling; } |
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286 void set_subklass(Klass* s); |
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287 void set_next_sibling(Klass* s); |
| 0 | 288 |
| 289 public: | |
| 290 | |
| 291 // Compiler support | |
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292 static ByteSize super_offset() { return in_ByteSize(offset_of(Klass, _super)); } |
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293 static ByteSize super_check_offset_offset() { return in_ByteSize(offset_of(Klass, _super_check_offset)); } |
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294 static ByteSize primary_supers_offset() { return in_ByteSize(offset_of(Klass, _primary_supers)); } |
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295 static ByteSize secondary_super_cache_offset() { return in_ByteSize(offset_of(Klass, _secondary_super_cache)); } |
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296 static ByteSize secondary_supers_offset() { return in_ByteSize(offset_of(Klass, _secondary_supers)); } |
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297 static ByteSize java_mirror_offset() { return in_ByteSize(offset_of(Klass, _java_mirror)); } |
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298 static ByteSize modifier_flags_offset() { return in_ByteSize(offset_of(Klass, _modifier_flags)); } |
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299 static ByteSize layout_helper_offset() { return in_ByteSize(offset_of(Klass, _layout_helper)); } |
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300 static ByteSize access_flags_offset() { return in_ByteSize(offset_of(Klass, _access_flags)); } |
| 0 | 301 |
| 302 // Unpacking layout_helper: | |
| 303 enum { | |
| 304 _lh_neutral_value = 0, // neutral non-array non-instance value | |
| 305 _lh_instance_slow_path_bit = 0x01, | |
| 306 _lh_log2_element_size_shift = BitsPerByte*0, | |
| 307 _lh_log2_element_size_mask = BitsPerLong-1, | |
| 308 _lh_element_type_shift = BitsPerByte*1, | |
| 309 _lh_element_type_mask = right_n_bits(BitsPerByte), // shifted mask | |
| 310 _lh_header_size_shift = BitsPerByte*2, | |
| 311 _lh_header_size_mask = right_n_bits(BitsPerByte), // shifted mask | |
| 312 _lh_array_tag_bits = 2, | |
| 313 _lh_array_tag_shift = BitsPerInt - _lh_array_tag_bits, | |
| 314 _lh_array_tag_type_value = ~0x00, // 0xC0000000 >> 30 | |
| 315 _lh_array_tag_obj_value = ~0x01 // 0x80000000 >> 30 | |
| 316 }; | |
| 317 | |
| 318 static int layout_helper_size_in_bytes(jint lh) { | |
| 319 assert(lh > (jint)_lh_neutral_value, "must be instance"); | |
| 320 return (int) lh & ~_lh_instance_slow_path_bit; | |
| 321 } | |
| 322 static bool layout_helper_needs_slow_path(jint lh) { | |
| 323 assert(lh > (jint)_lh_neutral_value, "must be instance"); | |
| 324 return (lh & _lh_instance_slow_path_bit) != 0; | |
| 325 } | |
| 326 static bool layout_helper_is_instance(jint lh) { | |
| 327 return (jint)lh > (jint)_lh_neutral_value; | |
| 328 } | |
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329 static bool layout_helper_is_array(jint lh) { |
| 0 | 330 return (jint)lh < (jint)_lh_neutral_value; |
| 331 } | |
| 332 static bool layout_helper_is_typeArray(jint lh) { | |
| 333 // _lh_array_tag_type_value == (lh >> _lh_array_tag_shift); | |
| 334 return (juint)lh >= (juint)(_lh_array_tag_type_value << _lh_array_tag_shift); | |
| 335 } | |
| 336 static bool layout_helper_is_objArray(jint lh) { | |
| 337 // _lh_array_tag_obj_value == (lh >> _lh_array_tag_shift); | |
| 338 return (jint)lh < (jint)(_lh_array_tag_type_value << _lh_array_tag_shift); | |
| 339 } | |
| 340 static int layout_helper_header_size(jint lh) { | |
| 341 assert(lh < (jint)_lh_neutral_value, "must be array"); | |
| 342 int hsize = (lh >> _lh_header_size_shift) & _lh_header_size_mask; | |
| 343 assert(hsize > 0 && hsize < (int)sizeof(oopDesc)*3, "sanity"); | |
| 344 return hsize; | |
| 345 } | |
| 346 static BasicType layout_helper_element_type(jint lh) { | |
| 347 assert(lh < (jint)_lh_neutral_value, "must be array"); | |
| 348 int btvalue = (lh >> _lh_element_type_shift) & _lh_element_type_mask; | |
| 349 assert(btvalue >= T_BOOLEAN && btvalue <= T_OBJECT, "sanity"); | |
| 350 return (BasicType) btvalue; | |
| 351 } | |
| 352 static int layout_helper_log2_element_size(jint lh) { | |
| 353 assert(lh < (jint)_lh_neutral_value, "must be array"); | |
| 354 int l2esz = (lh >> _lh_log2_element_size_shift) & _lh_log2_element_size_mask; | |
| 355 assert(l2esz <= LogBitsPerLong, "sanity"); | |
| 356 return l2esz; | |
| 357 } | |
| 358 static jint array_layout_helper(jint tag, int hsize, BasicType etype, int log2_esize) { | |
| 359 return (tag << _lh_array_tag_shift) | |
| 360 | (hsize << _lh_header_size_shift) | |
| 361 | ((int)etype << _lh_element_type_shift) | |
| 362 | (log2_esize << _lh_log2_element_size_shift); | |
| 363 } | |
| 364 static jint instance_layout_helper(jint size, bool slow_path_flag) { | |
| 365 return (size << LogHeapWordSize) | |
| 366 | (slow_path_flag ? _lh_instance_slow_path_bit : 0); | |
| 367 } | |
| 368 static int layout_helper_to_size_helper(jint lh) { | |
| 369 assert(lh > (jint)_lh_neutral_value, "must be instance"); | |
| 370 // Note that the following expression discards _lh_instance_slow_path_bit. | |
| 371 return lh >> LogHeapWordSize; | |
| 372 } | |
| 373 // Out-of-line version computes everything based on the etype: | |
| 374 static jint array_layout_helper(BasicType etype); | |
| 375 | |
| 376 // What is the maximum number of primary superclasses any klass can have? | |
| 377 #ifdef PRODUCT | |
| 378 static juint primary_super_limit() { return _primary_super_limit; } | |
| 379 #else | |
| 380 static juint primary_super_limit() { | |
| 381 assert(FastSuperclassLimit <= _primary_super_limit, "parameter oob"); | |
| 382 return FastSuperclassLimit; | |
| 383 } | |
| 384 #endif | |
| 385 | |
| 386 // vtables | |
| 387 virtual klassVtable* vtable() const { return NULL; } | |
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388 virtual int vtable_length() const { return 0; } |
| 0 | 389 |
| 390 // subclass check | |
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391 bool is_subclass_of(const Klass* k) const; |
| 0 | 392 // subtype check: true if is_subclass_of, or if k is interface and receiver implements it |
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393 bool is_subtype_of(Klass* k) const { |
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394 juint off = k->super_check_offset(); |
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395 Klass* sup = *(Klass**)( (address)this + off ); |
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396 const juint secondary_offset = in_bytes(secondary_super_cache_offset()); |
| 0 | 397 if (sup == k) { |
| 398 return true; | |
| 399 } else if (off != secondary_offset) { | |
| 400 return false; | |
| 401 } else { | |
| 402 return search_secondary_supers(k); | |
| 403 } | |
| 404 } | |
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405 bool search_secondary_supers(Klass* k) const; |
| 0 | 406 |
| 605 | 407 // Find LCA in class hierarchy |
| 0 | 408 Klass *LCA( Klass *k ); |
| 409 | |
| 410 // Check whether reflection/jni/jvm code is allowed to instantiate this class; | |
| 411 // if not, throw either an Error or an Exception. | |
| 412 virtual void check_valid_for_instantiation(bool throwError, TRAPS); | |
| 413 | |
| 414 // array copying | |
| 415 virtual void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS); | |
| 416 | |
| 417 // tells if the class should be initialized | |
| 418 virtual bool should_be_initialized() const { return false; } | |
| 419 // initializes the klass | |
| 420 virtual void initialize(TRAPS); | |
| 421 // lookup operation for MethodLookupCache | |
| 422 friend class MethodLookupCache; | |
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423 virtual Method* uncached_lookup_method(Symbol* name, Symbol* signature) const; |
| 0 | 424 public: |
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425 Method* lookup_method(Symbol* name, Symbol* signature) const { |
| 0 | 426 return uncached_lookup_method(name, signature); |
| 427 } | |
| 428 | |
| 429 // array class with specific rank | |
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430 Klass* array_klass(int rank, TRAPS) { return array_klass_impl(false, rank, THREAD); } |
| 0 | 431 |
| 432 // array class with this klass as element type | |
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433 Klass* array_klass(TRAPS) { return array_klass_impl(false, THREAD); } |
| 0 | 434 |
| 435 // These will return NULL instead of allocating on the heap: | |
| 436 // NB: these can block for a mutex, like other functions with TRAPS arg. | |
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437 Klass* array_klass_or_null(int rank); |
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438 Klass* array_klass_or_null(); |
| 0 | 439 |
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440 virtual oop protection_domain() const = 0; |
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441 |
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442 oop class_loader() const; |
| 0 | 443 |
| 7409 | 444 virtual oop klass_holder() const { return class_loader(); } |
| 445 | |
| 0 | 446 protected: |
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447 virtual Klass* array_klass_impl(bool or_null, int rank, TRAPS); |
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448 virtual Klass* array_klass_impl(bool or_null, TRAPS); |
| 0 | 449 |
| 450 public: | |
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451 // CDS support - remove and restore oops from metadata. Oops are not shared. |
| 0 | 452 virtual void remove_unshareable_info(); |
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453 virtual void restore_unshareable_info(TRAPS); |
| 0 | 454 |
| 455 protected: | |
| 456 // computes the subtype relationship | |
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457 virtual bool compute_is_subtype_of(Klass* k); |
| 0 | 458 public: |
| 459 // subclass accessor (here for convenience; undefined for non-klass objects) | |
| 460 virtual bool is_leaf_class() const { fatal("not a class"); return false; } | |
| 461 public: | |
| 462 // ALL FUNCTIONS BELOW THIS POINT ARE DISPATCHED FROM AN OOP | |
| 463 // These functions describe behavior for the oop not the KLASS. | |
| 464 | |
| 465 // actual oop size of obj in memory | |
| 466 virtual int oop_size(oop obj) const = 0; | |
| 467 | |
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468 // Size of klass in word size. |
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469 virtual int size() const = 0; |
| 7956 | 470 #if INCLUDE_SERVICES |
| 471 virtual void collect_statistics(KlassSizeStats *sz) const; | |
| 472 #endif | |
| 0 | 473 |
| 474 // Returns the Java name for a class (Resource allocated) | |
| 475 // For arrays, this returns the name of the element with a leading '['. | |
| 476 // For classes, this returns the name with the package separators | |
| 477 // turned into '.'s. | |
| 478 const char* external_name() const; | |
| 479 // Returns the name for a class (Resource allocated) as the class | |
| 480 // would appear in a signature. | |
| 481 // For arrays, this returns the name of the element with a leading '['. | |
| 482 // For classes, this returns the name with a leading 'L' and a trailing ';' | |
| 483 // and the package separators as '/'. | |
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484 virtual const char* signature_name() const; |
| 0 | 485 |
| 486 // garbage collection support | |
| 487 virtual void oop_follow_contents(oop obj) = 0; | |
| 488 virtual int oop_adjust_pointers(oop obj) = 0; | |
| 489 | |
| 490 // Parallel Scavenge and Parallel Old | |
| 491 PARALLEL_GC_DECLS_PV | |
| 492 | |
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493 // type testing operations |
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494 protected: |
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495 virtual bool oop_is_instance_slow() const { return false; } |
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496 virtual bool oop_is_array_slow() const { return false; } |
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497 virtual bool oop_is_objArray_slow() const { return false; } |
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498 virtual bool oop_is_typeArray_slow() const { return false; } |
| 0 | 499 public: |
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500 virtual bool oop_is_instanceMirror() const { return false; } |
| 0 | 501 virtual bool oop_is_instanceRef() const { return false; } |
| 502 | |
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503 // Fast non-virtual versions |
| 0 | 504 #ifndef ASSERT |
| 505 #define assert_same_query(xval, xcheck) xval | |
| 506 #else | |
| 507 private: | |
| 508 static bool assert_same_query(bool xval, bool xslow) { | |
| 509 assert(xval == xslow, "slow and fast queries agree"); | |
| 510 return xval; | |
| 511 } | |
| 512 public: | |
| 513 #endif | |
| 514 inline bool oop_is_instance() const { return assert_same_query( | |
| 515 layout_helper_is_instance(layout_helper()), | |
| 516 oop_is_instance_slow()); } | |
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517 inline bool oop_is_array() const { return assert_same_query( |
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518 layout_helper_is_array(layout_helper()), |
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519 oop_is_array_slow()); } |
| 0 | 520 inline bool oop_is_objArray() const { return assert_same_query( |
| 521 layout_helper_is_objArray(layout_helper()), | |
| 522 oop_is_objArray_slow()); } | |
| 523 inline bool oop_is_typeArray() const { return assert_same_query( | |
| 524 layout_helper_is_typeArray(layout_helper()), | |
| 525 oop_is_typeArray_slow()); } | |
| 526 #undef assert_same_query | |
| 527 | |
| 528 // Access flags | |
| 529 AccessFlags access_flags() const { return _access_flags; } | |
| 530 void set_access_flags(AccessFlags flags) { _access_flags = flags; } | |
| 531 | |
| 532 bool is_public() const { return _access_flags.is_public(); } | |
| 533 bool is_final() const { return _access_flags.is_final(); } | |
| 534 bool is_interface() const { return _access_flags.is_interface(); } | |
| 535 bool is_abstract() const { return _access_flags.is_abstract(); } | |
| 536 bool is_super() const { return _access_flags.is_super(); } | |
| 537 bool is_synthetic() const { return _access_flags.is_synthetic(); } | |
| 538 void set_is_synthetic() { _access_flags.set_is_synthetic(); } | |
| 539 bool has_finalizer() const { return _access_flags.has_finalizer(); } | |
| 540 bool has_final_method() const { return _access_flags.has_final_method(); } | |
| 541 void set_has_finalizer() { _access_flags.set_has_finalizer(); } | |
| 542 void set_has_final_method() { _access_flags.set_has_final_method(); } | |
| 543 bool is_cloneable() const { return _access_flags.is_cloneable(); } | |
| 544 void set_is_cloneable() { _access_flags.set_is_cloneable(); } | |
| 545 bool has_vanilla_constructor() const { return _access_flags.has_vanilla_constructor(); } | |
| 546 void set_has_vanilla_constructor() { _access_flags.set_has_vanilla_constructor(); } | |
| 547 bool has_miranda_methods () const { return access_flags().has_miranda_methods(); } | |
| 548 void set_has_miranda_methods() { _access_flags.set_has_miranda_methods(); } | |
| 549 | |
| 550 // Biased locking support | |
| 551 // Note: the prototype header is always set up to be at least the | |
| 552 // prototype markOop. If biased locking is enabled it may further be | |
| 553 // biasable and have an epoch. | |
| 554 markOop prototype_header() const { return _prototype_header; } | |
| 555 // NOTE: once instances of this klass are floating around in the | |
| 556 // system, this header must only be updated at a safepoint. | |
| 557 // NOTE 2: currently we only ever set the prototype header to the | |
| 558 // biasable prototype for instanceKlasses. There is no technical | |
| 559 // reason why it could not be done for arrayKlasses aside from | |
| 560 // wanting to reduce the initial scope of this optimization. There | |
| 561 // are potential problems in setting the bias pattern for | |
| 562 // JVM-internal oops. | |
| 563 inline void set_prototype_header(markOop header); | |
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564 static ByteSize prototype_header_offset() { return in_ByteSize(offset_of(Klass, _prototype_header)); } |
| 0 | 565 |
| 566 int biased_lock_revocation_count() const { return (int) _biased_lock_revocation_count; } | |
| 567 // Atomically increments biased_lock_revocation_count and returns updated value | |
| 568 int atomic_incr_biased_lock_revocation_count(); | |
| 569 void set_biased_lock_revocation_count(int val) { _biased_lock_revocation_count = (jint) val; } | |
| 570 jlong last_biased_lock_bulk_revocation_time() { return _last_biased_lock_bulk_revocation_time; } | |
| 571 void set_last_biased_lock_bulk_revocation_time(jlong cur_time) { _last_biased_lock_bulk_revocation_time = cur_time; } | |
| 572 | |
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573 TRACE_DEFINE_KLASS_METHODS; |
| 0 | 574 |
| 575 // garbage collection support | |
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576 virtual void oops_do(OopClosure* cl); |
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577 |
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578 // Iff the class loader (or mirror for anonymous classes) is alive the |
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579 // Klass is considered alive. |
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580 // The is_alive closure passed in depends on the Garbage Collector used. |
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581 bool is_loader_alive(BoolObjectClosure* is_alive); |
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582 |
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583 static void clean_weak_klass_links(BoolObjectClosure* is_alive); |
| 0 | 584 |
| 585 // Prefetch within oop iterators. This is a macro because we | |
| 586 // can't guarantee that the compiler will inline it. In 64-bit | |
| 587 // it generally doesn't. Signature is | |
| 588 // | |
| 589 // static void prefetch_beyond(oop* const start, | |
| 590 // oop* const end, | |
| 591 // const intx foffset, | |
| 592 // const Prefetch::style pstyle); | |
| 593 #define prefetch_beyond(start, end, foffset, pstyle) { \ | |
| 594 const intx foffset_ = (foffset); \ | |
| 595 const Prefetch::style pstyle_ = (pstyle); \ | |
| 596 assert(foffset_ > 0, "prefetch beyond, not behind"); \ | |
| 597 if (pstyle_ != Prefetch::do_none) { \ | |
| 598 oop* ref = (start); \ | |
| 599 if (ref < (end)) { \ | |
| 600 switch (pstyle_) { \ | |
| 601 case Prefetch::do_read: \ | |
| 602 Prefetch::read(*ref, foffset_); \ | |
| 603 break; \ | |
| 604 case Prefetch::do_write: \ | |
| 605 Prefetch::write(*ref, foffset_); \ | |
| 606 break; \ | |
| 607 default: \ | |
| 608 ShouldNotReachHere(); \ | |
| 609 break; \ | |
| 610 } \ | |
| 611 } \ | |
| 612 } \ | |
| 613 } | |
| 614 | |
| 615 // iterators | |
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616 virtual int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) = 0; |
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617 virtual int oop_oop_iterate_v(oop obj, ExtendedOopClosure* blk) { |
| 0 | 618 return oop_oop_iterate(obj, blk); |
| 619 } | |
| 620 | |
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621 #if INCLUDE_ALL_GCS |
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622 // In case we don't have a specialized backward scanner use forward |
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623 // iteration. |
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624 virtual int oop_oop_iterate_backwards_v(oop obj, ExtendedOopClosure* blk) { |
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625 return oop_oop_iterate_v(obj, blk); |
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626 } |
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627 #endif // INCLUDE_ALL_GCS |
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628 |
| 0 | 629 // Iterates "blk" over all the oops in "obj" (of type "this") within "mr". |
| 630 // (I don't see why the _m should be required, but without it the Solaris | |
| 631 // C++ gives warning messages about overridings of the "oop_oop_iterate" | |
| 632 // defined above "hiding" this virtual function. (DLD, 6/20/00)) */ | |
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633 virtual int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) = 0; |
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634 virtual int oop_oop_iterate_v_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) { |
| 0 | 635 return oop_oop_iterate_m(obj, blk, mr); |
| 636 } | |
| 637 | |
| 638 // Versions of the above iterators specialized to particular subtypes | |
| 639 // of OopClosure, to avoid closure virtual calls. | |
| 640 #define Klass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ | |
| 641 virtual int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk) { \ | |
| 642 /* Default implementation reverts to general version. */ \ | |
| 643 return oop_oop_iterate(obj, blk); \ | |
| 644 } \ | |
| 645 \ | |
| 646 /* Iterates "blk" over all the oops in "obj" (of type "this") within "mr". \ | |
| 647 (I don't see why the _m should be required, but without it the Solaris \ | |
| 648 C++ gives warning messages about overridings of the "oop_oop_iterate" \ | |
| 649 defined above "hiding" this virtual function. (DLD, 6/20/00)) */ \ | |
| 650 virtual int oop_oop_iterate##nv_suffix##_m(oop obj, \ | |
| 651 OopClosureType* blk, \ | |
| 652 MemRegion mr) { \ | |
| 653 return oop_oop_iterate_m(obj, blk, mr); \ | |
| 654 } | |
| 655 | |
| 656 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_1(Klass_OOP_OOP_ITERATE_DECL) | |
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657 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_2(Klass_OOP_OOP_ITERATE_DECL) |
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658 |
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659 #if INCLUDE_ALL_GCS |
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660 #define Klass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ |
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661 virtual int oop_oop_iterate_backwards##nv_suffix(oop obj, \ |
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662 OopClosureType* blk) { \ |
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663 /* Default implementation reverts to general version. */ \ |
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664 return oop_oop_iterate_backwards_v(obj, blk); \ |
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665 } |
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666 |
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667 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_1(Klass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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668 SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_2(Klass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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669 #endif // INCLUDE_ALL_GCS |
| 0 | 670 |
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671 virtual void array_klasses_do(void f(Klass* k)) {} |
| 0 | 672 |
| 673 // Return self, except for abstract classes with exactly 1 | |
| 674 // implementor. Then return the 1 concrete implementation. | |
| 675 Klass *up_cast_abstract(); | |
| 676 | |
| 677 // klass name | |
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678 Symbol* name() const { return _name; } |
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679 void set_name(Symbol* n); |
| 0 | 680 |
| 681 public: | |
| 682 // jvm support | |
| 683 virtual jint compute_modifier_flags(TRAPS) const; | |
| 684 | |
| 685 // JVMTI support | |
| 686 virtual jint jvmti_class_status() const; | |
| 687 | |
| 688 // Printing | |
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689 virtual void print_on(outputStream* st) const; |
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690 |
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691 virtual void oop_print_value_on(oop obj, outputStream* st); |
| 0 | 692 virtual void oop_print_on (oop obj, outputStream* st); |
| 693 | |
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694 virtual const char* internal_name() const = 0; |
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695 |
| 0 | 696 // Verification |
| 11034 | 697 virtual void verify_on(outputStream* st, bool check_dictionary); |
| 698 void verify(bool check_dictionary = true) { verify_on(tty, check_dictionary); } | |
| 0 | 699 |
| 700 #ifndef PRODUCT | |
| 701 void verify_vtable_index(int index); | |
| 702 #endif | |
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703 |
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704 virtual void oop_verify_on(oop obj, outputStream* st); |
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705 |
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706 private: |
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707 // barriers used by klass_oop_store |
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708 void klass_update_barrier_set(oop v); |
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709 void klass_update_barrier_set_pre(void* p, oop v); |
| 0 | 710 }; |
| 1972 | 711 |
| 712 #endif // SHARE_VM_OOPS_KLASS_HPP |